Data/hora: 12/06/2024 03:23:59

Biblioteca(s): 	Embrapa Unidades Centrais.	
Data corrente: 	02/09/2008	
Data da última atualização: 	29/06/2018	
Autoria: 	HAJIBOLAND, R.; BEIRAMZADEH, N.	
Afiliação: 	Roghieh Hajiboland, University of Tabriz/Plant Science Department; Naier Beiramzadeh, University of Tabriz/Plant Science Department.	
Título: 	Rhizosphere properties of rice genotypes as influenced by anoxia and availability of zinc and iron.	
Ano de publicação: 	2008	
Fonte/Imprenta: 	Pesquisa Agropecuária Brasileira, Brasília, DF, v. 43, n. 5, p. 613-622, maio 2008	
Idioma: 	Inglês	
Notas: 	Título em português: Propriedades da rizosfera de genótipos de arroz submetidos à anoxia e a diferentes disponibilidades de zinco e ferro.	
Conteúdo: 	The objective of this work was to study possible mechanisms involved in root-induced changes of rhizosphere physicochemical properties of rice genotypes, under anoxia and low supply of Zn and Fe. Two rice genotypes, including an upland and a lowland ones, were grown in hydroponic medium under adequate and low supply of Zn and Fe, with or without aeration. Anoxia increased shoot dry weight, root length and uptake of Zn and Fe in lowland Amol genotype, but reduced these parameters in upland Gasrol-Dashti genotype. The amount of oxygen released by roots was statistically higher in 'Amol'. The highest acidification potential of roots was observed in the lowland genotype under low supply of Zn, and in the upland genotype under Fe starvation. The highest oxalate (only organic acid detected) exudation from roots was observed in Zn and Fe deficient Gasrol-Dashti genotype. Zinc deficiency caused reduction of alcohol dehydrogenase and stimulation of lactate dehydrogenase activity, particularly in shoot. The ability to induce changes in the rhizosphere properties has a great contribution for the adaptation of both lowland and upland rice genotypes to specific soil conditions.	
Palavras-Chave: 	álcool desidrogenase; alpha-naphthylamine oxidation; arroz de terras altas; extrusão de prótons; lactato desidrogenase; lowland genotype; oxidação da alfa-naftilamina; proton release; upland genotype.	
Thesagro: 	Oryza Sativa; Várzea.	
Thesaurus Nal: 	alcohol dehydrogenase; lactate dehydrogenase.	
Categoria do assunto: 	--	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/39023/1/43n05a09.pdf	
Registro original: 	Embrapa Unidades Centrais (AI-SEDE)	
Exemplares: 	AI-SEDE - (44200-1) - UPE - AP - PP - 630.72081 - P474 -  - DIS